knocking noise TB42

[dwaynes]

this all sounds very simular to my GQ ( problem started 3 days ago )

got in the car to go to work turned it on and there was a loud knocking sound from the front of the motor as i was running late i drove to the train got out with car idling no noise any more.

so over the last couple of days i have noticed it only happens when it is cold early mornings or nights if the days are warm no noise even if left overnight and noise dissapears after driving for 500m.

so guys any ideas on what to check am starting a new thread as well just thought it may be relevant here as well.

[TUFFRANGIE]

Is it a tappet kind off knock? Probably something to do with the oil as it is thick when cold and obviously thins when the engine warms or it is a warm day.

[HeathGQ]

yeah what sort of 'knocking sound'? Tinny or a deep knock?

[dwaynes]

sounds like a deep knock

the problem is it is very intermintent like saturday happened every time i started the car the sunday i started the car 3 times and did not have the issue once.

i am starting to get very confused.

[planb]

mine did this on thursday morning also, but only once, and not since

i think its a big end bearing kinda sound

[dwaynes]

i think its a big end bearing kinda sound

I take it this bad.
mine is weird if i sit in front it is very load coming through the radiator and sounds to be dead centre but pop th e bonnet and it sounds to be comming from the air con side.

my motor has only done 40000km's since reco motor was put in.

[J Top]

An idler pulley bearing will do this when the grease is cold and thick.
Take off your belts and check the pulley's for roughness.
Leave it standing overnight with no belts and see if the noise is there with the cold morning start.
J Top

[bogged]

i think its a big end bearing kinda sound

I take it this bad..

there arent much worse.. Thats the bearings on your crank which is in the sump which the conrods are connected to.